115 citations · 329 across the 10 of their papers we have counts for
10 papers
Two-dimensional Phononic Crystals with Acoustic-Band Negative Refraction
Hossein Sadeghi, Sia Nemat-Nasser
A two-dimensional phononic crystal (PC) can exhibit longitudinal-mode negative energy refraction on its lowest (acoustical) frequency pass band. The effective elastodynamic propert…
Acoustic Filter Design Using Temperature Tuning
Hossein Sadeghi, A. Srivastava, A. V. Amirkhizi +1
The material properties selection for designing acoustic filters with optimal performance over a range of frequencies requires considerable effort to fabricate and test laboratory…
Optimal Design of Layered Periodic Composites for Mitigation of Impact-Induced Elastic Waves
Hossein Sadeghi, Sia Nemat-Nasser
A systematic method for optimal design of layered periodic composites for mitigation of impact-induced shock waves is presented. Frequency spectrum of a pulse with a sharp rise-tim…
On the Limit and Applicability of Dynamic Homogenization
Ankit Srivastava, Sia Nemat-Nasser
Recent years have seen considerable research success in the field of dynamic homogenization which seeks to define frequency dependent effective properties for heterogeneous composi…
Mixed-variational formulation for phononic band-structure calculation of arbitrary unit cells
Ankit Srivastava, Sia Nemat-Nasser
This paper presents phononic band-structure calculation results obtained using a mixed variational formulation for 1-, and 2-dimensional unit cells. The formulation itself is prese…
Anti-plane Shear Waves in Layered Composites: Band Structure and Anomalous Wave-refraction
Sia Nemat-Nasser
For oblique anti-plane shear waves in periodic layered elastic composites, it is shown that negative energy refraction is accompanied by positive phase-velocity refraction and posi…
Bounds on Effective Dynamic Properties of Elastic Composites
Sia Nemat-Nasser, Ankit Srivastava
We present general, computable, improvable, and rigorous bounds for the total energy of a finite heterogeneous volume element or a periodically distributed unit cell of an elastic…
Universal Theorems for Total Energy of the Dynamics of Linearly Elastic Heterogeneous Solids
Ankit Srivastava, Sia Nemat-Nasser
In this paper we consider a sample of a linearly elastic heterogeneous composite in elastodynamic equilibrium and present universal theorems which provide lower bounds for the tota…
Overall Dynamic Properties of 3-D periodic elastic composites
Ankit Srivastava, Sia Nemat-Nasser
A method for the homogenization of 3-D periodic elastic composites is presented. It allows for the evaluation of the averaged overall frequency dependent dynamic material constitut…
Overall Dynamic Constitutive Relations of Micro-structured Elastic Composites
Sia Nemat-Nasser, Ankit Srivastava
A method for homogenization of a heterogeneous (finite or periodic) elastic composite is presented. It allows direct, consistent, and accurate evaluation of the averaged overall fr…